Black urine may be hematuria. This condition should be taken seriously enough, and it is recommended that you must drink more water and urinate more often to get rid of the black urine out of the body. To go to the hospital for examination, do ultrasound examination of kidney ureter and bladder, which can determine whether there are blood clots in the bladder and kidneys, as well as determine whether there are stones. Most importantly, it is important to rule out the presence of a urinary tumor. This is because bleeding caused by a tumor is relatively small, but it is possible that it may be stored in the bladder and can cause a blood clot to occur. It can also be due to a lot of bleeding in a short period of time, which forms a large blood clot. After the blood clot is machined, there will be black hematuria.